The Electro-oxidation of Hydrazine with Palladium Nanoparticle Modified Electrodes: Dissecting Chemical and Physical Effects: Catalysis, Surface Roughness, or Porosity?

2021 ◽  
pp. 6661-6666
Author(s):  
Ruiyang Miao ◽  
Minjun Yang ◽  
Richard G Compton
Keyword(s):  
Surface Roughness ◽  
Modified Electrodes ◽  
Palladium Nanoparticle ◽  
Electro Oxidation ◽  
Physical Effects

Ascorbate electro-oxidation by modified electrodes: Polypyrrole and polypyrrole/Ni(OH)2 composite thin films

2012 ◽  
Vol 520 (20) ◽  
pp. 6424-6428 ◽  
Author(s):  
Marcelo Rodrigues da Silva ◽  
Marcelo Silva Ferreira ◽  
Luiz Henrique Dall'Antonia
Keyword(s):  
Thin Films ◽  
Modified Electrodes ◽  
Composite Thin Films ◽  
Electro Oxidation

Facilitated Electro-Oxidation of Formic Acid at Nickel Oxide Nanoparticles Modified Electrodes

2012 ◽  
Vol 159 (7) ◽  
pp. F249-F254 ◽  
Author(s):  
Gumaa A. El-Nagar ◽  
Ahmad M. Mohammad ◽  
Mohamed S. El-Deab ◽  
Bahgat E. El-Anadouli
Keyword(s):  
Formic Acid ◽  
Nickel Oxide ◽  
Modified Electrodes ◽  
Oxide Nanoparticles ◽  
Nickel Oxide Nanoparticles ◽  
Electro Oxidation

Pure Metal Nanoparticles for Selective Electrochemical Sensor of Organic Substances

2016 ◽  
Vol 683 ◽  
pp. 288-294
Author(s):  
Anastasiia V. Shabalina ◽  
Kceniya Belova
Keyword(s):  
Ascorbic Acid ◽  
Electrode Surface ◽  
Metallic Nanoparticles ◽  
Modified Electrodes ◽  
Pure Metal ◽  
Electrochemical Analysis ◽  
Stabilizing Agents ◽  
Sensitivity And Selectivity ◽  
Electro Oxidation ◽  
Surface Increase

The field of application of electrochemical analysis has been significantly widened after modified electrodes appeared. Metallic nanoparticles are ones of the most common used modifiers of the electrode surface to increase the sensitivity and selectivity of the analysis. Increasing of selectivity is extremely important in cases when two or more analyts have electro-chemical signals at nearly the same values of electrode potential. Dopamine and ascorbic acid are an example of such case. In present work Au, Pt, Pd, and Ni “pure” nanoparticles obtained by laser ablation without stabilizing agents were used to modify the surface of a glassy carbon electrode. Modified electrodes were tested in solutions of ascorbic acid and dopamine at their simultaneous electro-oxidation. It was shown that Au, Pt, and Ni nanoparticles on the electrode surface increase the selectivity of analysis giving two separate peaks of analyts.

scholarly journals The mathematical description of dopamine electrochemical oxidation, accompanied by its chemical and electrochemical polymerization

2020 ◽  
Vol 15 (1) ◽  
pp. 47-52
Author(s):  
Volodymyr Tkach ◽  
Marta Kushnir ◽  
Yana Ivanushko ◽  
Svitlana Lukanova ◽  
Silvio C. de Oliveira ◽  
...  
Keyword(s):  
Electrochemical Oxidation ◽  
Electrochemical Polymerization ◽  
Modified Electrodes ◽  
Accurate Method ◽  
Point Of View ◽  
Biologically Active ◽  
Theoretical Point ◽  
Anticorrosive Coatings ◽  
Electro Oxidation ◽  
The Mathematical Model

The electrooxidation of dopamine is accompanied by its chemical and electrochemical polymerization, and in which either the monomer or the polymer may be oxidized to the respective quinonic form, was investigated from the theoretical point of view. Dopamine is one of the important neurotransmitters in human and mammal organisms. It is a precursor to epinephrine, which influences the cardiovascular, hormonal and renal functions. Its lack causes diseases like Parkinson, therefore, dopamine has been used as a drug for their treatment. On the other hand, its excess stimulates the sympatic nervous system yielding the metabolic disorders and even schizophrenia. Thus, the development of the rapid and accurate method for its concentration measurement is very important. Dopamine is very popular analyte in electroanalytical systems. The modified electrodes for its determinations have been developed by many researchers. Dopamine is widely used as a monomer for synthesis of a conducting polymer – polydopamine, whis is used as electrodes’ modifier in capacitors and in anticorrosive coatings. The electropolymerization of dopamine into polydopamine proceeds along with its traditional quinone-hydroquinonic oxidation. Both processes give their impact to the electrochemical behavior of dopamine during its electropolymerization. The mechanism’s complexity is also responsible for the electrochemical instabilities during electro-oxidation. In order to understand these instabilities it’s necessary to develop the mathematical model that is capable to describe the behavior of the system. It also helps us to esteem the influence of the electrochemical instabilities, by which it may be accompanied. The goal of this work is to describe an electrochemical oxidation and polymerization of dopamine that will provide an important connection between the electrochemical detection of biologically active compounds and their electropolymerization for electrode modification.

Sulfonated graphene-modified electrodes for enhanced capacitive performance and improved electro-oxidation of hydrogen peroxide

2020 ◽  
Vol 24 ◽  
pp. 100531 ◽  
Author(s):  
Soumili Daripa ◽  
Vivek Kumar Singh ◽  
Om Prakash ◽  
Pralay Maiti ◽  
Biplab Kumar Kuila ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Modified Electrodes ◽  
Capacitive Performance ◽  
Sulfonated Graphene ◽  
Oxidation Of Hydrogen ◽  
Electro Oxidation

Preparation of polythiophene-modified electrodes by electrodeposition of Pt and Pt+Pb. Application to formic acid electro-oxidation

1995 ◽  
Vol 380 (1-2) ◽  
pp. 219-227 ◽  
Author(s):  
R. Schrebler ◽  
M.A. del Valle ◽  
H. Go´mez ◽  
C. Veas ◽  
R. Co´rdova
Keyword(s):  
Formic Acid ◽  
Modified Electrodes ◽  
Electro Oxidation
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